练习册

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    Was it in 1998,when he was still at middle school, this boy became expert at computer? A.which B.where C.when D.that 【查看更多】

     

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    Was it in 1998, when he was still at middle school, ______ this boy became expert at computer?

    [　　]

    A．which
    B．where
    C．when
    D．that

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    Was it in 1998, when he was still at middle school, ________ this boy became an expert at computer?

    [　　]

    A．which

    B．where

    C．when

    D．that

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